A study carried out by SAMER (Political and Social Research Center) in December 2013 in Istanbul and Izmir analyzes the characteristics of the electorate in a number of dimensions, including their participation in or support of the Gezi movement. Contrary to the AKP government?s claims, it seems that a representative cross-section of the population participated in or supported Gezi, including a sizable percentage of Kurds. The study (in Turkish) is here. I?ve translated a rundown of the Gezi-related results from Erdem Yoruk?s column on T24.

16% (1.5 million) of Istanbul?s population participated in the Gezi protests. The study only counted respondents above age 18, so the participation of under-18s will presumably drive this number higher.